Series 5 AFM on Series 4 car
#1
88 AE
Thread Starter
Join Date: Mar 2002
Location: N/A
Posts: 2,865
Likes: 0
Received 0 Likes
on
0 Posts
Series 5 AFM on Series 4 car
I was wondering if the Series 5 AFM flows any better than the flapper door of the Series 4. And if so, is it possible to swap onto an S4 without much work. I know this sounds like a n00b post but I tried to search, but you cant search for "S5" or "S4" because they are 2 letters long.
#2
Rotary Enthusiast
no, I'm pretty sure they are not swappable. It doesn't make enough of a difference to worry about it. Yes the S5 flows better, but only by a small margin.
Just think, the s4 turbo uses the exact same sized afm as the s4 N/A, but it flows a lot more air. It takes a lot more air to run the engine at 7k with 10 psi boost than at 7k with no boost.
If you are really that concerned about it, buy a stand-alone and eliminate it completely, but that really isn't worth it on an N/A unless you have some sort of crazy port job and you need to tune for it.
Just think, the s4 turbo uses the exact same sized afm as the s4 N/A, but it flows a lot more air. It takes a lot more air to run the engine at 7k with 10 psi boost than at 7k with no boost.
If you are really that concerned about it, buy a stand-alone and eliminate it completely, but that really isn't worth it on an N/A unless you have some sort of crazy port job and you need to tune for it.
Last edited by rotary>piston; 05-12-03 at 10:01 PM.
#3
88 AE
Thread Starter
Join Date: Mar 2002
Location: N/A
Posts: 2,865
Likes: 0
Received 0 Likes
on
0 Posts
If you are really that concerned about it, buy a stand-alone and eliminate it completely, but that really isn't worth it on an N/A unless you have some sort of crazy port job and you need to tune for it.
I am concerned about it, because its probably the most restictive part of my powertrain. But Im not going to drop a few grand on a standalone to fix the problem.
Anybody know if you can port the AFM without messing up its sensoring?
#7
Rotary Enthusiast
Join Date: Aug 2001
Location: Tallahassee, FL
Posts: 1,402
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by BDoty311
I am concerned about it, because its probably the most restictive part of my powertrain. But Im not going to drop a few grand on a standalone to fix the problem.
Anybody know if you can port the AFM without messing up its sensoring?
I am concerned about it, because its probably the most restictive part of my powertrain. But Im not going to drop a few grand on a standalone to fix the problem.
Anybody know if you can port the AFM without messing up its sensoring?
http://www.team140.net/modules.php?n...article&sid=17
Brandon
BR7 Racing
Trending Topics
#10
Rotary Enthusiast
Join Date: Aug 2001
Location: Tallahassee, FL
Posts: 1,402
Likes: 0
Received 0 Likes
on
0 Posts
Can't do ignition, tho! And the Microtech laptop software, with its datalog playback is mmm-mmm good. The Megasquirt is nice, but it's not nearly a complete solution.
Brandon
BR7 Racing
Brandon
BR7 Racing
#11
Super Raterhater
iTrader: (6)
Join Date: Dec 2001
Location: NY, MA, MI, OR, TX, and now LA or AZ!
Posts: 10,624
Likes: 0
Received 2 Likes
on
2 Posts
Megasquirt has datalog playback, I wrote most of it myself. And it'll do ignition soon enough, but a 12a dizzy always works, and piggybacking the stock ECU is fine!
#13
Rotorhead
Join Date: Feb 2001
Location: Charlottesville, Virginia, USA
Posts: 9,136
Likes: 0
Received 39 Likes
on
33 Posts
Originally posted by Rotorific
https://www.rx7club.com/forum/attach...&postid=945053 ...dont remember where i got this i think that ted posted it one time.
https://www.rx7club.com/forum/attach...&postid=945053 ...dont remember where i got this i think that ted posted it one time.
IMO the AFM swap is a complete waste of time, especially given the low price of modern aftermarket EMS products, but to each his own.
Originally posted by Makenzie71
weber 48IDA's do not need an AFM...or anything else for that matter.
weber 48IDA's do not need an AFM...or anything else for that matter.
#16
88 AE
Thread Starter
Join Date: Mar 2002
Location: N/A
Posts: 2,865
Likes: 0
Received 0 Likes
on
0 Posts
A few grand? Hehehehe...
#21
I'm a boost creep...
Join Date: Jan 2002
Location: Auckland, New Zealand
Posts: 15,608
Likes: 0
Received 8 Likes
on
8 Posts
Originally posted by Makenzie71
lol...yeah...but think about how clean the engine bay is...right?
lol...yeah...but think about how clean the engine bay is...right?
Besides, the benefits of EFI far outweigh having a few extra wires in the engine bay.
As for the AFM swap, the S5 AFM causes no less restriction than the S4 one, and is not calibrated to work with the S4 ECU. There will be some changes in the A/F ratios, and since no one appears to have ever done any before-and-after testing of this, you don't even know how much they'll change. That's not smart modifying. IMO this is a pointless exercise.
Last edited by NZConvertible; 05-14-03 at 01:24 AM.
#22
Rotorhead
Join Date: Feb 2001
Location: Charlottesville, Virginia, USA
Posts: 9,136
Likes: 0
Received 39 Likes
on
33 Posts
Originally posted by NZConvertible
Wrong. If you know what you're doing you can make an EFI engine bay look just as clean as a carb one. I know someone with a 1st Gen powered by a 13B BP with an IDA-style TB and Microtech ECU that has only one wiring loom about the size of your thumb in the entire engine bay...
Besides, the benefits of EFI far outweigh having a few extra wires in the engine bay.
Wrong. If you know what you're doing you can make an EFI engine bay look just as clean as a carb one. I know someone with a 1st Gen powered by a 13B BP with an IDA-style TB and Microtech ECU that has only one wiring loom about the size of your thumb in the entire engine bay...
Besides, the benefits of EFI far outweigh having a few extra wires in the engine bay.
https://www.rx7club.com/forum/showth...hreadid=183851
Originally posted by NZConvertible
As for the AFM swap, the S5 AFM causes no less restriction than the S4 one, and is not calibrated to work with the S4 ECU. There will be some changes in the A/F ratios, and since no one appears to have ever done any before-and-after testing of this, you don't even know how much they'll change. That's not smart modifying. IMO this is a pointless exercise.
As for the AFM swap, the S5 AFM causes no less restriction than the S4 one, and is not calibrated to work with the S4 ECU. There will be some changes in the A/F ratios, and since no one appears to have ever done any before-and-after testing of this, you don't even know how much they'll change. That's not smart modifying. IMO this is a pointless exercise.
I agree that this is a pointless exercise because you still can't tune the ECU, and it is still running with the ancient S4 computer that is half the speed of the S5 computer.
#23
Eat, sleep, work, mod.
Join Date: Jun 2001
Location: Long Island
Posts: 2,517
Likes: 0
Received 0 Likes
on
0 Posts
if u want to play w AFMs he S4 is a beter one to use...be sure to do it on a dyno but the crude spring adjustment method can yield gains on an NA by leaning (worked for me, run a solid 850 celcius on my EGT 3rd gear WOT). or richening on a TII if you're running a little more boost. dyno only...or you may pop your motor.
#25
I'm a boost creep...
Join Date: Jan 2002
Location: Auckland, New Zealand
Posts: 15,608
Likes: 0
Received 8 Likes
on
8 Posts
Originally posted by Evil Aviator
I would imagine that the S5 AFM is in fact less restrictive than the S4 AFM...
I would imagine that the S5 AFM is in fact less restrictive than the S4 AFM...
Like you say, there's probably not much in it, and there are other reasons why there's no point to doing this swap. I still believe the risk of unknown changes to mixtures should be enough to stop anyone doing this to a modified car that might not have ideal mixtures as it is.
BTW, if anyone's curious as to why Mazda (and most other manufacturers) swapped if there's no flow benefits, it's because they give a more accurate reading and have a more linear output than the flap types. But it's impossible to take advantage of these benefits unless you have the matching ECU.
Thread
Thread Starter
Forum
Replies
Last Post
trickster
2nd Generation Specific (1986-1992)
25
07-01-23 04:40 PM